JVC DILA FP Type Displays

[Anonymous]

JVC THX HD750 DILA projector

Greetings

I had a chance yesterday to calibrate my first JVC THX unit at a client’s home.

Calibration is all done in the user side and all the controls we want are there. Grayscale offers both gains and offsets so that is good. There is a more in depth multipoint gamma/grayscale system in the user menu too. I did not have to use this part. When you get a final answer with average dE at 0.7 and nothing over 2 … you stop caring about further fine tuning.

The grayscale controls work fine.

The TV has CMS now … all 18 controls too … each color has a saturation, hue, and brightness associated with it.

Now here is the problem. I’m not sure the CMS works right.

There is not enough range in the CMS to reduce the triangle to Rec 709. YOu can get the red and the blue to hit the target, but the green gets only about 60% closer versus where it starts. The triangle is still too big on the green side. And what is worse … after the CMS is done, when you double check the Jennifer flesh tone, she looks under saturated … enough so that you have to turn up the color saturation to make her look right again. And with that action, the triangle expands back out again.

The filters got use to -9 on the color sat scale … and the image only looked right at +10 … a 19 digit swing. The funny thing here is that I never looked at the Jennifer girl while using the normal wide gamut of the TV so I was never “tainted” by it.

So if you use the CMS … beware of its limitations … and consider that it may just not work right anyway.

CMS … 18 controls

Hue
Saturation/Brightness (not just saturation so watch out)
Brightness

As for the THX mode of the TV … I took a quick shot of where the THX gamut sits and it was pretty close to the 709 triangle. Unless you use the THX, there is no other way to make the gamut even close to 709. All controls in THX mode are locked out except color/brightness/contrast and tint. It is preset to 6500 … but I did not bother to take a grayscale reading at 6500k.

It’s a step forward from the Panasonic and LG THX plasma sets … but not quite there yet. I hope at some point there is an ability to tweak the THX mode to fine tune it. It needs it.

regards

[Gregg Loewen]

hi guys
More info…
Use the THX mode…it will give you an accurate color gamut for rec 709.
Then enter the service mode to tweek the gray scale.
To enter the SM:
up down right left enter
the above can be done from the remote control.
the above needs to be done very quickly and you may have to attempt it 10-20 times.
Gary at JVC is looking into getting us a macro to make this easier.

[Anonymous]

It is possible to get the user CMS to be close if not dead on to the 709 gamut, but it has to be done in conjunction with lowering the color saturation control too. This can be done outside the THX mode.

It will be time consuming though.

Success, I was able to dial it in more precisely outside the THX mode … with the saturation control about -20 range.

This gets the three parameters dialed in …but once again, double check the image with a known reference.

regards

[Gregg Loewen]

Attached is a copy of my last calibration.
If I remember correctly the Color was plus 5-10 from center when I was finished.

[Gregg Loewen]

Calibration report

[sumit singh]

I am a JVC Pro reseller and was just notified that JVC Professional has a firmware update for the RS20. It will address issues with the remote control operation and CMS usability, according to the JVC Region Mgr here in the Western USA. I just calibrated an RS20 using the RGB Gains/Offsets in Custom 1 mode and got everything to track except the Rec 709 color gamut. Settings were Contrast -26, Brightness 10, Color 2, Tint 1, Red Gain -28, Green Gain -33, Blue Gain, -87, Red Offset -37, Green Offset -36, Blue Offset -29. Jennifer looked very good and the blu-ray movie performance was the best I’ve seen. The THX mode was close to Rec 709; the THX RGB levels were good overall with Blue being off 5%-8% worst case and Red/Green being spot on across the range.

[sumit singh]

Additional Information on the JVC RS20 Firmware Update 1.1:
First and foremost, it extends the range of the built-in CMS so calibrators can easily correct the color gamut to conform to Rec 709. The adjustment range is now from -60 to 60 versus -30 to 30 in the original firmware.
Second, it improves the IR remote control performance and connectivity.
The firmware can be obtained at http://www.jvc.com/. Click “Support and Service” in the lower right hand section of the webpage. Then click “Software” under the “Downloads” heading.

[Anonymous]

Note on SM grayscale adjustments with new 1.1 firmware.

The values will reset themselves to the original default values if you are not careful. Choose only the screen where the 6 rgb adjustments are visible. Do not advance to the single adjustment line that shows up at the bottom of the screen. This resets the entire 6 settings back to default values … again and again.

If you make the grayscale changes with the 6 items visible … the reset does not occur.

You can also redefine which color temp setting the THX mode will use here. It does not have to be the “6500” selection. Pick any other temp and it will default to that selection.

regards

[Anonymous]

@John Sien 1425 wrote:

Additional Information on the JVC RS20 Firmware Update 1.1:
First and foremost, it extends the range of the built-in CMS so calibrators can easily correct the color gamut to conform to Rec 709. The adjustment range is now from -60 to 60 versus -30 to 30 in the original firmware.
Second, it improves the IR remote control performance and connectivity.
The firmware can be obtained at http://www.jvc.com/. Click “Support and Service” in the lower right hand section of the webpage. Then click “Software” under the “Downloads” heading.

I did not see the firmware update for the RS20. Any help?

[Anonymous]

@Michael TLV 1495 wrote:

Note on SM grayscale adjustments with new 1.1 firmware.

The values will reset themselves to the original default values if you are not careful. Choose only the screen where the 6 rgb adjustments are visible. Do not advance to the single adjustment line that shows up at the bottom of the screen. This resets the entire 6 settings back to default values … again and again.

If you make the grayscale changes with the 6 items visible … the reset does not occur.

You can also redefine which color temp setting the THX mode will use here. It does not have to be the “6500” selection. Pick any other temp and it will default to that selection.

regards

Michael,

Is there really a need to enter the SM? A complete and thorough calibration should be able to be performed with user controls. Is this correct?

[Anonymous]

@Lee Gallagher 1551 wrote:

I did not see the firmware update for the RS20. Any help?

Nevermind. It is actually listed under the DLA-HD750BU update.

[Author]

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